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The condition so that the line (x + g) c...

The condition so that the line `(x + g) cos theta + (y+f) sintheta = k` is a tangent to ` x^2 + y^2 + 2gx+2fy+c =0` is

A

`g^(2)+f^(2)=c+k^(2)`

B

`g^(2)+f^(2)=c^(2)+k^(2)`

C

`g^(2)+f^(2)=c^(2)-k^(2)`

D

`g^(2)+f^(2)=c-k^(2)`

Text Solution

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The correct Answer is:
A
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